Firebase在用户注册期间将图像上载到存储-FirebaseUploadImagetoStorageDuringUserRegistration

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My guess is that profilePicImageView.image doesn't actually contain a valid image object.

我的猜测是profilePicImageView.image实际上并不包含有效的图像对象。

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HOW TO REGISTER A USER

如何注册用户

Let's assume that you have 3 textfields to register a user. You have a usernameTextfield, an emailTextField, and a passwordTextfield. We also want to have a profilePicture associated with this user. So we first:

假设您有3个文本字段来注册用户。您有usernameTextfield，emailTextField和passwordTextfield。我们还希望将profilePicture与此用户相关联。所以我们先：

Established a method to save our values for our User to the Firebase Database:

建立了一种方法，将我们的用户值保存到Firebase数据库：

-(void) saveValuesForUser:(FIRUser *) user
{
    NSString *username = usernameTxtField.text;
    self.databaseRef = [[FIRDatabase database] reference];
    [[[databaseRef child:@"users"] child:user.uid]
     setValue:@{@"Name": username, @"Profile Picture": profileImageURL}];
}

The profileImageURL above is an NSString that you can create above your implementation of your view controller, but we also should create a UIImage that we can access throughout the ViewController:

上面的profileImageURL是一个NSString，您可以在视图控制器的实现之上创建，但我们也应该创建一个我们可以在整个ViewController中访问的UIImage：

#import "ViewController.h"
@import Photos;
@interface ViewController ()

@end

NSString *profileImageURL;
UIImage *profileImage;

@implementation ViewController

I'm guessing that you know how to launch the camera roll off from a UIButton but in case you do not, let's call these methods so that when our user taps the button to choose their image that it get's set to our profilePicture.imageView:

我猜你知道如何从UIButton启动相机滚动，但是如果你不这样做，让我们调用这些方法，以便当我们的用户点击按钮选择他们的图像时，它被设置为我们的profilePicture.imageView：

- (IBAction)chooseImageAction:(id)sender

{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:picker animated:YES completion:NULL];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{
    picker.delegate = self;
    profileImage = info[UIImagePickerControllerEditedImage];
    profilePicImageView.image = profileImage;
    [self dismissViewControllerAnimated:NO completion:nil];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{
    [picker dismissViewControllerAnimated:YES completion:NULL];
}

Now we're cooking with fire! Now that we have the image the user wants to upload for their profilePicture, let's create a method to save it as an NSURL to our Firebase Database:

现在我们正在用火烹饪！现在我们已经拥有了用户想要为其profilePicture上传的图像，让我们创建一种方法将其作为NSURL保存到我们的Firebase数据库：

- (void) saveProfileImage

{
    FIRUser *currentUser = [FIRAuth auth].currentUser;
    NSString *username = usernameTxtField.text;

    if (profilePicImageView.image != nil)
    {
        FIRStorage *storage = [FIRStorage storage];
        storageRef = [storage referenceForURL:@"gs://PUTYOURFIREBASEHERE.appspot.com"];
        NSString *imageID = [[NSUUID UUID] UUIDString];
        NSString *imageName = [NSString stringWithFormat:@"Profile Pictures/%@.jpg",imageID];
        FIRStorageReference *profilePicRef = [storageRef child:imageName];
        FIRStorageMetadata *metadata = [[FIRStorageMetadata alloc] init];
        metadata.cOntentType= @"image/jpeg";
        NSData *imageData = UIImageJPEGRepresentation(self.profilePicImageView.image, 0.8);        
        [profilePicRef putData:imageData metadata:metadata completion:^(FIRStorageMetadata *metadata, NSError *error)
         {
             if (!error)
             {
                 profileImageURL = metadata.downloadURL.absoluteString;
                 [self saveValuesForUser: currentUser];
             }
             else if (error)
             {
                 NSLog(@"Failed to Register User with profile image");
             }
         }];
    }
}

IMPORTANT: Make sure you insert your gs:// reference for the value of storageRef! You can find this on your Firebase Console under Storage.

重要信息：确保插入gs：// reference以获取storageRef的值！您可以在存储下的Firebase控制台上找到此信息。

Now that we have the method to save the user's profile picture, let's create a method to Register the new user that we can call it on our IBAction:

现在我们有了保存用户个人资料图片的方法，让我们创建一个注册新用户的方法，我们可以在IBAction上调用它：

- (void) registerNewUser

{
    NSString *email = emailAddressTxtField.text;
    NSString *password = passwordTxtField.text;
    [[FIRAuth auth]
     createUserWithEmail:email
     password:password
     completion:^(FIRUser *_Nullable user,
                  NSError *_Nullable error)
     {
         if (error)
         {
             NSLog(@"%@", error.localizedDescription);
             return;
         }
         else
         {
             [self saveProfileImage];
         }
     }];
}

Oh thats nice! Now, let's call that method on our button, so that when the user taps the Register button on our UI, that it get's called:

哦，那很好！现在，让我们在我们的按钮上调用该方法，这样当用户点击我们的UI上的Register按钮时，就会调用它：

- (IBAction)registerUserAction:(id)sender
{

[self registerNewUser];

}

Note: Make sure that in your ViewController.h file that you are setting the appropriate delegates:

注意：确保在ViewController.h文件中设置了相应的委托：

@interface ViewController : UIViewController